package com.scaffold.springbootscaffold.common;

import com.fasterxml.jackson.databind.ObjectMapper;
import org.springframework.core.MethodParameter;
import org.springframework.http.MediaType;
import org.springframework.http.converter.HttpMessageConverter;
import org.springframework.http.server.ServerHttpRequest;
import org.springframework.http.server.ServerHttpResponse;
import org.springframework.web.bind.annotation.RestControllerAdvice;
import org.springframework.web.servlet.mvc.method.annotation.ResponseBodyAdvice;

@RestControllerAdvice
public class ResponseAdvice implements ResponseBodyAdvice<Object> {

    @Override
    public boolean supports(MethodParameter returnType, Class<? extends HttpMessageConverter<?>> converterType) {
        // 如果已经是Result类型，则不需要再包装
        return !returnType.getParameterType().equals(Result.class);
    }

    @Override
    public Object beforeBodyWrite(Object body, MethodParameter returnType, MediaType selectedContentType,
                                Class<? extends HttpMessageConverter<?>> selectedConverterType,
                                ServerHttpRequest request, ServerHttpResponse response) {
        // String类型需要特殊处理
        if (returnType.getGenericParameterType().equals(String.class)) {
            ObjectMapper objectMapper = new ObjectMapper();
            try {
                return objectMapper.writeValueAsString(Result.success(body));
            } catch (Exception e) {
                return Result.error(e.getMessage());
            }
        }
        return Result.success(body);
    }
} 